180aad1520
In dev mode, viteDevServer.ssrLoadModule re-evaluates server/app.ts on every request, creating a new postgres connection pool each time and eventually exhausting Postgres's max_connections limit. Cache the client on globalThis so HMR re-evaluations reuse the same pool. Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
37 lines
1.6 KiB
TypeScript
37 lines
1.6 KiB
TypeScript
import { createRequestHandler } from "@react-router/express";
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import { drizzle } from "drizzle-orm/postgres-js";
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import express from "express";
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import postgres from "postgres";
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import type { ServerBuild } from "react-router";
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import { RouterContextProvider } from "react-router";
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import { DatabaseContext } from "~/database/context";
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import * as schema from "~/database/schema";
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import { expressValueContext } from "~/contexts/express";
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export const app = express();
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if (!process.env.DATABASE_URL) throw new Error("DATABASE_URL is required");
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// In dev, ssrLoadModule re-evaluates this file on every request. Cache the
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// client on globalThis so HMR re-loads reuse the same connection pool instead
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// of leaking a new one each time.
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declare global {
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// TypeScript requires `var` in `declare global` blocks — `let`/`const` are not allowed here.
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var __pgClient: ReturnType<typeof postgres> | undefined; // eslint-disable-line no-var
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}
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const client = (globalThis.__pgClient ??= postgres(process.env.DATABASE_URL));
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const db = drizzle(client, { schema });
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app.use((_, __, next) => DatabaseContext.run(db, next));
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app.use(
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createRequestHandler({
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build: () => import("virtual:react-router/server-build") as unknown as Promise<ServerBuild>,
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// @ts-ignore -- RouterContextProvider is the correct runtime type but tsconfig.server.json can't resolve the conditional type statically
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getLoadContext() {
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const provider = new RouterContextProvider();
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provider.set(expressValueContext, "Hello from Express");
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return provider as unknown as RouterContextProvider;
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},
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}),
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);
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